When I get up the next afternoon, I groan and hold my head in pain.

“Oooow….Hangover….” I get up and trudge to the bathroom. When I look in the mirror, I yelp. I’m naked?! “Why am I…” I remember the night’s events all at once. I blush deeply.

“O-Oh, right….Wow. My first time, and it was with a monarch from another dimension….Who would’ve thunk it.” I clean myself up and get myself dressed before going back to check on Luna. I notice instantly that she’s different. Her belly has a slight pudge to it, and her butt definitely grew.

“Oh. My. God…..I made her bigger….Oh, I hope she won’t be upset…” I go over to her and gently tap her shoulder. “Luna? Luuna? Are you okay?” “Mmm….sister, five more minutes….” “Luna, it’s Sam.” She groggily opens her eyes. “Ooooow…. My head….” She sits up and stretches. “How...do you feel?” I ask, a little nervous.

“Mm….other than our head hurting and our butt a bit sore, just fine. Why?” “Uuh, I think you grew a little last night.” I admit. Her eyes widen and she gets up, looking in her mirror. She feels her little pudgy belly, then turns to her side, lifting her butt up before letting it drop. “Oh, my….” “I’m so sorry, Luna. I didn’t know this would happen.” “This looks amazing…”

“Wait, what?” She hugs me tightly into her plush body. “We’ve always wanted to put on weight, but it’s difficult for an alicorn. Now we can!” “Well, um...glad I can help.” I chuckle, hugging her back. She giggles excitedly and goes into her closet. She comes back out wearing yoga pants and a sports bra. I blush deeply.

“Ooh, we love having a belly~” She pats it. “Let’s go join Tia for lunch!” “Uh...okay.” We head downstairs to the dining hall. As soon as we walk in, Celestia looks at Luna in surprise. “Sister, what happened? You look...fuller.” She comments. Luna beams, holding my hand. “Well, we and Sam had, uh...you know….and it turned to weight on my figure! Isn’t it great? “I’m quite happy for you, sister, but do you think you and Samuel are moving rather fast?” I keep silent.

“Not at all! We fell in love the moment we saw one another!” She smiles. Celestia looks at me, and I simply nod in agreement.

“Well, alright. Did you at least use protection?” “Of course we did! Even though he never got to that point, we used a protection spell.” Celestia blushes bright red. Luna giggles and sits, and I sit beside her. Before we eat, a scroll of parchment appears in front of Celestia. “Oh, a letter from Twilight.” She opens it and reads through it.

Her expression goes from happiness to concern. “Sam, may i have a word please?” “Um, I suppose?” I get up. “I’ll be right back, Luna.” I smile at her as Tia and I step outside. “Sam, Twilight has just sent me the results of your physical exams.” “What happened? Am I dying?!” “Oh, heavens no. But, I asked her to examine your machine parts as well as your living ones, and I have some possibly unsettling news.” “Just spit it out already. Please, Princess.”

“Well, when you and your machine merged together from the change, most of the components merged into your body. And according to Twilight’s data, I’m afraid to say that you’ll be aging a lot slower than most other ponies here.” “What...does that mean?” “Whatever brought you here made you immortal.” My heart plummets. I forgot about the apple test results.

“I…...Immortal…..Is….is there no way to reverse it?” “Sadly, no. Not without killing you. And you know as well as I that you won’t survive like this back at your home….” “Are...you saying that I’m staying?” “I’m afraid so.” I should be feeling all sorts of emotions, but all i feel is….happy. “You know….I think I’ll be okay. You and Luna don’t age either.” “You really do love my sister, don’t you?” I nod.

“Tread carefully, Sam. She’s very kind, but she has her darker sides.” “I know. And i still love her.” “Then you have my blessing to continue this relationship.” I nod and smile, going back to the table, sitting back down. “What did she say?” “I, uh...I’m apparently immortal….And I can’t go home.” “Oh, Sam….We’re so sorry…” “No. Don’t be. I’m actually okay. I want to stay. With you.” I hold her hand gently. She smiles at me lovingly, and I return the smile. We eat lunch together. And after we finish, she suggests something interesting.

“Sam, would you like to live here? In the castle?” “Do you have a spare room?” “Well, we were thinking you could stay in our room.” “Oh. Well, I don’t see why not.” She squeals adorably and hugs me tightly. I smile and hug her back. “Luna, can you teach me to teleport? And maybe levitate things?” “Ooh, of course! We would love to!” I smile and drag her back to her room this time.

I hear Celestia laughing as we leave. Once we get to her room, she smiles. “Okay. Firstly, you need to see where you want to go in your mind really clearly. Then, focus on that place, and your magic does the rest. Got it?” I nod excitedly. I think about the throne room and concentrate on it hard. I shut my eyes and feel that familiar lurch. When I open my eyes, i’m standing in the throne room.

“Awesome! I can teleport!” I teleport all over the castle before stopping back in Luna’s room. She beams proudly. “That was great! You’re a really fast learner. Now for levitation. For that, keep eye contact with what you want to carry, and imagine it floating where you want it. If you get good enough, you can do it without looking.” I grin and focus on her.

Her body glows a blue and orange glow as she gets lifted. “Woah! I did it!” She laughs. “Put me dooown!” She giggles. I set her on the bed, and she smiles. “We’re impressed. You learn almost as fast as Twilight.” I smile and laugh. “I’m gonna go pack up my….Well, my stuff at the unused house. I’ll be back, okay?” I kiss her cheek. “Alright, don’t be too long~” She grins. I blush and teleport to the house.

I gather up all the clothes I find and fold them. I also decide to take the microwave and fridge. I lift them with my magic. “Hope this works…” I teleport back to Luna’s room. “Yes! I did it!” I set the stuff down and look at the bed. No Luna. I shrug, figuring she went to the bathroom. I put the fridge and microwave in a corner and put my clothes in the fridge. When I turn back, Luna is standing in the doorway to her closet, wearing thigh-high stocking, a lace thong, a bra, and high heels. “You kept us waiting~” “Oh, oh my God…” I stare at her, mesmerized. She sauntered over to me and grins. “Take those clothes off, Mister~” I nod and quickly take my clothes off, standing naked.

“Do you have any particular tastes? In mares, we mean.” She asks. “Uuh...why do you ask?” She holds up my phone. “How...how did you get that?” “We took it before you teleported. You have some rather interesting pictures of us on here.” She giggles. “How do you even know how to use that?” I blush deeply. “We read your thoughts.” She pulls up an image of her with an extremely massive ass.

[https://derpibooru.org/1769989?q=moonbutt]

“Did you draw this?” “Um...No.” “Ah, but you have masturbated to it, haven’t you.” I gulp. Shit, I’m caught. “Y-yes….” I admit. She giggles and makes her horn glow. I don’t notice anything at first, until I hear the sound of fabric creaking. She moans and blushes deeply, setting my phone down. I blush deeply, noticing that her butt was growing! My nose starts to bleed.

“Holy fuck….” Luna giggles and lifts me, throwing me onto the bed. I get a full view of her ass as it swells like marshmallows in a microwave. She giggles lustfully and shakes it, making her cheeks slap together. I can’t turn away, or even blink as I stare.

I only blink when I notice that it’s looming over me now. “Uuh L-MMMMMPH!?” I grunt and squirm as she sits on top of me. I moan in pure bliss as her ass swells around me. I grope and kiss her fat, swelling cheeks. “Ooooh, Sam this feels so gooooood~ We’ll have to do this more often~” She bounces her ass on top of me, making the bed creak. She and I both moan loudly as my cock slams deep into her tight pussy. I barely have time to fathom what’s going on before I moan loudly, cumming hard inside her. She moans and coos as her belly swells. “Mmmmm~ Good boy~” She gets up and shrinks to normal, leaving me laying on the bed, completely shocked.

“Can...you do that anytime you want?” I manage to ask. “Mhm~” She giggles and gets dressed. I shakily stand and get dressed, too. “Um….Where are we going?” “Oh, to the Throne Room. We hate to say, Sam. But you’ll have to change your name.” “What? Why?” “Well, if you want to fit in here, you’ll have to have a name that fits.” I sigh. “I guess you’re right.”

She smiles and hugs me gently. “Hey, we had a name in mind. If you want to hear it.” I chuckle. “Alright. What did you have in mind?” “We were thinking of Cross Beam.” “Cross Beam….I like it. Doctor Cross Beam.” She smiles and kisses me deeply before pulling me along towards the throne room. As we get inside, Princess Celestia is sitting on her throne, reading a scroll.

“Ah, Luna! You finally made it! And Sam is with you!” “Indeed! Sister, we decided on a name for Sam.” “Really? What have you decided? Sam?” “Well, we were thinking Cross Beam.” She taps her chin in thought. “That is a perfect name! I’ll put it into the records, but we need to record your appearance. So you’ll have to change to normal.” She pulls out a book and quill. “Conductor, disengage cloak.” My fur turns from green to the blue and orange. She jots down a few notes in the book, then smiles. “Alright. I decree you shall henceforth be named Doctor Cross Beam.” I smile brightly. “Wow, this is gonna be a big change for me.” I rub the back of my neck and chuckle. Luna hugs me gently. “Hey, it’ll be okay. We’ll help you get used to our culture. Well, to the best of our knowledge.” She giggles cutely. I can’t help but to laugh. “Yeah, I have a feeling I may need more help with getting used to this...I need to learn the bits system, and I need a job….” Luna smiles. “We’ll write to Twilight right away! We’ll be around if you need us, Cross~”

She kisses my cheek and vanishes with a pop. I shrug, bow slightly to Celestia, then head out of the throne room. “Composer Green.” I shift back to green as I get to a large archway, leading to a garden. I decide to take a stroll, passing by several statues, including one familiar draconequus. “So, you’re Discord, huh? Not so scary up close.” I chuckle as I look into his eyes. “Okay, uh...maybe a little creepy…” I shuffle away. After another hour of walking, I end up in the middle of a fork in the road. I didn’t realize I had wandered into the labyrinth. I try to teleport, but it fails. “Huh….Guess this place is magic cancelling…” I head left and follow the path.

When I stop, I’m face to face with another Discord statue. Well, I think it’s a statue. It looks...more real this time. “Huh….Why would they have two statues? Unless….the other one was fake….and this is the real Discord.” I knock on the statue’s toes. “If you’d be so kind as to not knock on me.” I yelp, hearing a voice in my head. “Wh-who’s there?” “Oh, come now. Don’t play stupid. You and I both know who I am.”

“Discord? You….sound different. Like your voice is deeper.” “Well, I don’t know how I sound to you. Now, why do I smell such chaos from a seemingly normal unicorn stallion, hmm? Unless there’s something about you that isn’t normal.” “I, uh...have no idea what you’re talking about.” He groans. “You lie worse than that Applejack mare.”

I hear stone crumbling before I can see the statue crumble, revealing the real Discord. “Finally free! It’s been years!” He flips around in midair before gathering his thoughts, literally, and sitting on them. (Try picturing that) “You really are full of chaos if you alone released me. So what makes you so special?” “Uuh….my personality?” He laughs loudly. “Oh, hardly! There’s only one possibility. You aren’t from this place, are you?” “Well, I mean….Manehattan is a ways from here, I guess.” He gets right in my face, uncomfortably close. “Further than that. Your energy smells….foreign. Not of Equestria.” He snaps, and a birdcage appears around me, trapping me inside. “Hey! What the fuck!?” “Ah! I know that vulgarity anywhere. You’re from that Earth, aren’t you?” I stay silent this time. He laughs and holds the cage up to his face. Jesus, he’s tall… “Normally, I would just turn you to a frog and go about my business, but I feel that you may be of some use to me. So, let’s see what’s in that little head of yours.” He suddenly shouts in pain and drops the cage. “Agh! What the...What is in there!? I barely scratched the surface and hit something….unnatural! And I know unnatural.”

“Look, just let me go okay? You just go to Fluttershy and get yourself reformed.” “Me? Reformed? HAHAHAHAHA! That’s truly hilarious! Why would I give up my fun?” “Discord, you and I both know that you’re lonely in your solitude and what you really want is love. So, why don’t you disguise yourself as a pony and try to find someone?”

He just stares at me. “.....What are you…?” “Uh...I’m Doctor Cross Beam.” “Hmm…..I’ve decided. I’m going to take you on your offer, but I want to know more about you, Doctor Cross…” He snaps, and his form changes from his usual self to an average-looking stallion with messy red hair and grey fur. I pry open the bars of the cage and get out. He snaps and vanishes. I let out a massive sigh. “That could’ve been bad….Alright, I just need to find Luna and tell her about Discord.”

I feel a sharp pain at the base of my horn, and a voice in my head again. “Do you really think I would let you just wander off and tell everyone? You see, I left a little piece of magic in your brain that prevents you from telling anyone about me. Tata!” I shake my head as the voice vanishes. “Okay, then I should go….to Ponyville. To see about a job.” My horn glows, and I vanish with a pop.

Author's Note

Sorry for any weird spacing in this. I'm uploading both on mobile and on PC, so the copy/paste is a little off. And if amyone wants to do a spin-off story of this guy for any reason, feel free to do so. I don't mind. Just credit me if you do. Hope you enjoy!